Query documents not defined in a Mongoose model-CodePudding

I query a Mongo collection called interventions with Mongoose's findById method on the Intervention model. The query returns all fields defined in the associated model.

A student field also exists in the interventions collection. Mongoose is not returning it. Presumably, this is because the complex student object (25-30 key/value pairs) is NOT defined in the Interventions model. I won't ever need to insert documents into the Interventions model.

import mongoose from 'mongoose'

const { Schema } = mongoose

const interventionSchema = new Schema(
  {
    abs_count_excused: { type: Number },
    abs_count_unexcused: { type: Number },
    abs_count_total: { type: Number },
    student_id: { type: Number, required: true }
  }
)

const Intervention = mongoose.model(
  'Intervention',
  interventionSchema,
  'interventions'
)
export default Intervention

Is it possible to retrieve the student subdocument without defining it in the Interventions model?

Thank you.

CodePudding user response：

I don't believe you can retrieve a value from MongoDB without having it as part of your Mongoose schema in some way. This seems like an opportunity for the Mixed schema type for Mongoose.

Because your concern is translating the complex student document to a schema and you don't plan on updating it through the Intervention model, the drawback of the Mixed schema type doesn't apply. As such, you can add the student field to your schema like so:

const interventionSchema = new Schema(
  {
    abs_count_excused: { type: Number },
    abs_count_unexcused: { type: Number },
    abs_count_total: { type: Number },
    student_id: { type: Number, required: true },
    student: { type: Object }
  }
)